Sydney to Kangaroo Island is an approximately 5.5-hour combination of flight and taxi. You can also do a combination of car and ferry; or do a combination of bus, car, and ferry. Finish your sightseeing early on the 17th (Mon) so you can travel to Adelaide.

You can do a combination of taxi and flight from Kangaroo Island to Adelaide in 2.5 hours. Other options are to do a combination of car and ferry; or do a combination of car, ferry, and bus. In December in Adelaide, expect temperatures between 30°C during the day and 17°C at night. Finish your sightseeing early on the 19th (Wed) so you can travel back home.